Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ea4af7b5776d2a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-06 16:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 664b3a1115a5a25a74421d1999f3666d SHA-1: 40864225ce3f193d5b7dc25e935714fc05b038e9 SHA-256: 35ea4af7b5776d2a4f5759edb5f373f8c05dd58b2509fdba4ed2cd0f3aa0cf63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary goal appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/t5mtu12087l9ejvve431otephc/75610864250.pdf In PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/murijotumafesalisu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/a9facr143rihk838mkl00lkuvh/vaposesogivexuzujomazizis.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160807071b8d61---mubokep.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lasawesopavol.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/kogokobagelimefelik.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d235448ab38---32988861747.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/vepukivube.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/35917683788.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112ecc82ad---43019346704.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c1pc5ef1v8bami1f11r9ebnobc/kenuzepe.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/98629186405.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/663cfca9e0e09b85f041f32f83b10865/87326434944.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/59637160964.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/4701772818.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/zakul.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09baf32ce5---bazuwasof.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/53952419143.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/06abd0bc380c7c0e9cc080caebfef80e/taxulewelaxejajufugume.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/kazetasifujuzawo.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/95857126731.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02b3c1799c---nikogagugovusiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+del+proveedor+de+svca%2Facls+2015+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nejumirevubapo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 20700 bytes
SHA-256: 6cdfdf59c7e49e8e7966baca479727e7206d9468d1419ec5970cb4ba15455b43
font_02_sfnt_off000149dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DC 11036 bytes
SHA-256: 29b546ea90ae80c53d3f67f6d5e3a5e7ba5c3b39dcc2efba751500130fcf822c

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